PACMHCI V9, MHCI, September 2025 Editorial MHCI001

Welcome to the 2025 Mobile Human-Computer Interaction (MHCI) issue of the Proceedings of the ACM on Human-Computer Interaction (PACMHCI), which highlights current advances from the MHCI community. This issue features research on mobile, wearable, and personal technologies that shape how people work, communicate, move through cities, and experience the world. As mobile systems reach deeper into daily life, the community continues to balance technical innovation with social responsibility, addressing privacy, equity, safety, and long-term impact. This year, we received 147 valid submissions and accepted 40 papers, for an acceptance rate of 27.2%. Authors are invited to present their work at MobileHCI 2025, held September 22 to 25, 2025, in Sharm El-Sheikh, Egypt. The papers span privacy and security in mobile contexts, health and wellbeing applications, accessibility and assistive technologies, novel input and interaction techniques, sensing and on-device intelligence, and emerging experiences in mixed and extended reality. Our editorial process followed a rigorous two-round, double-blind review. We are grateful to our 36 Associate Editors (AEs), who coordinated expert reviews and constructive discussions, and to the 230 external reviewers who contributed their time and insight delivered in 269 reviews. Their efforts ensured a fair and thorough evaluation and helped authors improve their work. Additionally, this year, six submissions were desk-rejected because they were clearly out of scope or incomplete. Eight additional submissions were assisted desk rejected, where the primary AE discussed the paper with the track chairs and determined that external reviews were unnecessary. This practice ensured that reviewer capacity was focused on submissions with a reasonable chance of acceptance, while still upholding fairness and transparency in decision-making. The conference theme, “Diving into Mobile AI,” invites the community to explore how AI-driven mobile technologies can empower diverse communities, from dense urban centers to rural regions, to foster collective progress. While the theme did not influence paper selection, many accepted works speak directly to it, advancing methods, tools, and experiences that make mobile AI more usable, trustworthy, and impactful. We hope you enjoy reading the articles in this issue and that they inspire new ideas for research, design, and practice in Mobile HCI.